| Baby Name | Meaning | Gender |
|---|
| Janka | Hungarian Form Of Joanna (God Is Gracious) | Female |
| Janko | Gift From God | Male |
| Janna | Paradise | Female |
| Jarek | January | Male |
| Joachim | God Prepares | Male |
| Joanna | Gift From God | Female |
| Jola | Jehovah Is God | Female |
| Jozef | He Shall Add. | Male |
| Julia | Youthful | Female |
| Julian | Youth | Male |
| Julianna | Youthful | Female |
| Julita | Youthful | Female |
| Justyn | Unknown | Male |
| Justyna | "Justice, Honest, Fair, Rightful According To A German Calendar, There Is A Name Day On September 26" | Female |
| Kalina | Flower | Female |
| Kamil | Perfect; One Of The Ninety-Nine Qualities Of God | Male |
| Kamila | Perfect | Female |
| Kamilla | Perfection. | Female |
| Karina | Form Of Karen; Pure KIRA, KIROCHKA | Female |
| Karol | Feminine Variant Of Charles Meaning Manly | Female |
| Karolina | Feminine Form Of Karl (Manly) | Female |
| Kasandra | Variant Of Greek Kassandra. Unheeded Prophetess. | Female |
| Kasia | Alert. Vigorous. Modern Variant Of Casey. | Male |
| Kasper | A Treasured Secret. | Male |
| Kassia | Variant Of Katherine. Pure. | Female |